Interobserver discrepancy in liver fibrosis using transient elastography

Area of Science:

• Hepatology
• Medical Imaging
• Diagnostic Techniques

Background:

• Transient elastography (TE) is widely used for non-invasive liver fibrosis staging.
• Concerns persist regarding the reliability and reproducibility of TE, particularly interobserver variability.
• Understanding factors influencing TE variability is crucial for accurate clinical application.

Purpose of the Study:

• To evaluate interobserver variability in transient elastography measurements.
• To identify factors associated with discrepancies in TE results between different operators.
• To enhance the understanding of TE's reproducibility in clinical practice.

Main Methods:

• A cross-sectional study comparing TE results from two independent operators performing tests sequentially.
• Statistical analysis included correlation tests and parametric/nonparametric tests to compare results.
• Multivariate analysis was employed to identify factors linked to result discrepancies.

Main Results:

• 333 pairs of TE tests were analyzed, with 325 (97.6%) deemed valid.
• A statistically significant difference was observed between the first and second operator measurements (P=0.012).
• Discrepancies of at least 2 kPa were found in 26.7% of tests, and higher stiffness was significantly associated with greater discordance (P < 0.001).

Conclusions:

• Interobserver discrepancy is a common issue in transient elastography for liver fibrosis assessment.
• Higher liver stiffness values are associated with increased variability between operators.
• Addressing these discrepancies is essential for improving the reliability of TE in clinical settings.